ReadFileList Method

Artikkeli
12/03/2008

This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.

The ReadFileList method returns a QueryResults object enumerating the Microsoft SQL Server database files maintained on a backup media.

Syntax

object
.ReadFileList(
Server
)
as
QueryResults

Parts

object
Expression that evaluates to an object in the Applies To list

Server
SQLServer object connected to an instance of SQL Server on which the backup device or operating system file is visible

Prototype (C/C++)

HRESULT ReadFileList(
LPSQLDMOSERVER ServerObject,
LPSQLDMOQUERYRESULTS* ppResults);

Returns

A QueryResults object containing one result set defined by these columns.

Column	Data type	Description
LogicalName	nvarchar(130)	Logical name for the database file.
PhysicalName	nvarchar(261)	Name of the operating system file implementing the database logical file.
Type	nvarchar(25)	When D, the operating system file maintains data. When L, the operating system file maintains log records.
FileGroupName	nvarchar(130)	Name of the filegroup to which the database file belongs. NULL for files maintaining log records.
Size	numeric(20, 0)	Size, in bytes, of the operating system file at the time that the backup image was created.
MaxSize	numeric(20, 0)	Maximum size, in bytes, that the operating system file can attain.

Remarks

When using the ReadFileList method, one of the Restore object device properties must indicate the device maintaining the backup media.

To use the ReadFileList method

Create a SQLServer object.
Connect the SQLServer object to an instance of SQL Server on which the source backup device is visible.
Create a Restore object.
Set either the Devices, Files, Pipes, or Tapes property to indicate a device visible on an instance of SQL Server indicated in Step 2 and maintaining the backup media. Specify only a single device or file.
If desired, set the FileNumber property to indicate a specific backup set by ordinal location on the media. By default, the database files of the first backup set are enumerated.
Call the ReadFileList method of the Restore object using the SQLServer object created in Step 1 as an argument.

When the media of a backup device is unused, such as when a disk device is empty, the ReadFileList method succeeds, returning an empty QueryResults object.

Applies To:

Restore Object

Jaa